Comment 2 for bug 695033

It is not uncommon for the last-translator to be the same. We wouldn't want to lose that (and if we did, we wouldn't even have to worry about hashes or anything: we'd have both a DB value and an actual value from a PO file at hand, which we could easily compare).

Also, external tools already support Last-Translator (any good PO file editor will set it automatically, but people sometimes update PO files in bare text editors or "bad" PO editors).